Class: EventBusService
Can keep track of multiple subscribers to different events and run the subscribers when events happen. Events will run asynchronously.
Hierarchy
TransactionBaseService↳
EventBusService
Implements
IEventBusService
Constructors
constructor
• new EventBusService(__namedParameters, config, isSingleton?)
Parameters
| Name | Type | Default value |
|---|---|---|
__namedParameters | InjectedDependencies | undefined |
config | any | undefined |
isSingleton | boolean | true |
Overrides
TransactionBaseService.constructor
Defined in
medusa/src/services/event-bus.ts:32
Properties
__configModule__
• Protected Optional Readonly __configModule__: Record<string, unknown>
Inherited from
TransactionBaseService.__configModule__
Defined in
medusa/src/interfaces/transaction-base-service.ts:14
__container__
• Protected Readonly __container__: any
Inherited from
TransactionBaseService.__container__
Defined in
medusa/src/interfaces/transaction-base-service.ts:13
__moduleDeclaration__
• Protected Optional Readonly __moduleDeclaration__: Record<string, unknown>
Inherited from
TransactionBaseService.__moduleDeclaration__
Defined in
medusa/src/interfaces/transaction-base-service.ts:15
config_
• Protected Readonly config_: ConfigModule
Defined in
medusa/src/services/event-bus.ts:24
enqueue_
• Protected enqueue_: Promise<void>
Defined in
medusa/src/services/event-bus.ts:30
eventBusModuleService_
• Protected Readonly eventBusModuleService_: IEventBusModuleService
Defined in
medusa/src/services/event-bus.ts:27
manager_
• Protected manager_: EntityManager
Inherited from
TransactionBaseService.manager_
Defined in
medusa/src/interfaces/transaction-base-service.ts:5
shouldEnqueuerRun
• Protected shouldEnqueuerRun: boolean
Defined in
medusa/src/services/event-bus.ts:29
stagedJobService_
• Protected Readonly stagedJobService_: StagedJobService
Defined in
medusa/src/services/event-bus.ts:25
transactionManager_
• Protected transactionManager_: undefined | EntityManager
Inherited from
TransactionBaseService.transactionManager_
Defined in
medusa/src/interfaces/transaction-base-service.ts:6
Accessors
activeManager_
• Protected get activeManager_(): EntityManager
Returns
EntityManager
Inherited from
TransactionBaseService.activeManager_
Defined in
medusa/src/interfaces/transaction-base-service.ts:8
Methods
atomicPhase_
▸ Protected atomicPhase_<TResult, TError>(work, isolationOrErrorHandler?, maybeErrorHandlerOrDontFail?): Promise<TResult>
Wraps some work within a transactional block. If the service already has a transaction manager attached this will be reused, otherwise a new transaction manager is created.
Type parameters
| Name |
|---|
TResult |
TError |
Parameters
| Name | Type | Description |
|---|---|---|
work | (transactionManager: EntityManager) => Promise<TResult> | the transactional work to be done |
isolationOrErrorHandler? | IsolationLevel | (error: TError) => Promise<void | TResult> | the isolation level to be used for the work. |
maybeErrorHandlerOrDontFail? | (error: TError) => Promise<void | TResult> | Potential error handler |
Returns
Promise<TResult>
the result of the transactional work
Inherited from
TransactionBaseService.atomicPhase_
Defined in
medusa/src/interfaces/transaction-base-service.ts:56
emit
▸ emit<T>(data): Promise<void | StagedJob[]>
Calls all subscribers when an event occurs.
Type parameters
| Name |
|---|
T |
Parameters
| Name | Type | Description |
|---|---|---|
data | EmitData<T>[] | The data to use to process the events |
Returns
Promise<void | StagedJob[]>
the jobs from our queue
Implementation of
EventBusTypes.IEventBusService.emit
Defined in
medusa/src/services/event-bus.ts:112
▸ emit<T>(eventName, data, options?): Promise<void | StagedJob>
Calls all subscribers when an event occurs.
Type parameters
| Name |
|---|
T |
Parameters
| Name | Type | Description |
|---|---|---|
eventName | string | the name of the event to be process. |
data | T | the data to send to the subscriber. |
options? | Record<string, unknown> | options to add the job with |
Returns
Promise<void | StagedJob>
the job from our queue
Implementation of
EventBusTypes.IEventBusService.emit
Defined in
medusa/src/services/event-bus.ts:121
enqueuer_
▸ enqueuer_(): Promise<void>
Returns
Promise<void>
Defined in
medusa/src/services/event-bus.ts:185
shouldRetryTransaction_
▸ Protected shouldRetryTransaction_(err): boolean
Parameters
| Name | Type |
|---|---|
err | Record<string, unknown> | { code: string } |
Returns
boolean
Inherited from
TransactionBaseService.shouldRetryTransaction_
Defined in
medusa/src/interfaces/transaction-base-service.ts:37
startEnqueuer
▸ startEnqueuer(): void
Returns
void
Defined in
medusa/src/services/event-bus.ts:175
stopEnqueuer
▸ stopEnqueuer(): Promise<void>
Returns
Promise<void>
Defined in
medusa/src/services/event-bus.ts:180
subscribe
▸ subscribe(event, subscriber, context?): EventBusService
Adds a function to a list of event subscribers.
Parameters
| Name | Type | Description |
|---|---|---|
event | string | symbol | the event that the subscriber will listen for. |
subscriber | Subscriber<unknown> | the function to be called when a certain event happens. Subscribers must return a Promise. |
context? | SubscriberContext | subscriber context |
Returns
this
Implementation of
EventBusTypes.IEventBusService.subscribe
Defined in
medusa/src/services/event-bus.ts:78
unsubscribe
▸ unsubscribe(event, subscriber, context): EventBusService
Removes function from the list of event subscribers.
Parameters
| Name | Type | Description |
|---|---|---|
event | string | symbol | the event of the subcriber. |
subscriber | Subscriber<unknown> | the function to be removed |
context | SubscriberContext | subscriber context |
Returns
this
Implementation of
EventBusTypes.IEventBusService.unsubscribe
Defined in
medusa/src/services/event-bus.ts:98
withTransaction
▸ withTransaction(transactionManager?): EventBusService
Parameters
| Name | Type |
|---|---|
transactionManager? | EntityManager |
Returns
Implementation of
EventBusTypes.IEventBusService.withTransaction
Overrides
TransactionBaseService.withTransaction